[6.0] Add swift-foundation/swift-foundation-icu branch to release/6.0 checkout config #75338
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Cherry pick of #75339
Explanation: Adds an explicit branch to the update-checkout config for releease/6.0 for the swift-foundation and swift-foundation-icu repos
Scope: Affects checking out swift-foundation/swift-foundation-icu on release/6.0 builds
Original PR: #75339
Risk: Minimal - this just specifies a branch for a checkout that is not yet used on this scheme
Testing: Testing done via swift-ci toolchain builds/testing